Machine for welding flues



March 24, 1931. W A DUNCAN 1,798,074

MACHINE FOR WELDING FLUES Filed Feb. 26, 1926 3 Sheets-Sheet l a? 94 Q25?, l, Z6 Z6 Q25 J7 61x 05 6/'5 o L 7 6% Z5 E 35 l O D l Q11 @y E e30 jf ggg O t Q Z7 J0 Vl l1- I'/ l' lx J0 ZZ March 24, 1931. W, A DUNCAN 1,798,074

MACHINE FOR WELDING FLUES Filed Feb. 26, 1926 3 Sheets-Sheet 2 I March 24, 1931. W` A. DUNCAN 1,798,74

MACHINE FOR WELDING FLUES Filed Feb. 26, 192e s sheets-sheet 3 lNVENTOR @W MW' m WNESSJZMa/z Mgg Patented Mar. 24, 1931 WILLIAM A. DUNCAN, orV oo vING'roN, KENTUCKY MACHINE FOR WELDING FLUES Application mea February 2s, 192e. serial No. 90,883.

The object of this invention is to provide, a machine oi the type specified, a particular form of mandrel and rolls for reducing, opening, and scaring lues which have become defective, and welding thereto an end section, or safety end, for the purpose of restoring to serviceable condition a boiler flue or su erheater iue.

A furt 'er object is to provide particular means for reducing the end portions of new tubesor lues.

With the foregoing and other objects in view, the invention consists in the novel construction and arrangement of elements described, illustrated and claimed, it being understood that modifications may be made in the scope of the claims, without departing from the spirit of the invention.

In the drawings forming part of thisapplication,

Figure 1 is a view of the machine to which the mandrel of special form, and the cooperating rolls of particular type are applied, the view being in elevation.

Figure 2 is an elevation of the structure of Figure 1 from another angle.

Figure 3 is a section longitudinally of the mandrel and the rolls, a fragmentary portion of a new lue to be reduced being illustrated.

Figur mandrel and rolls being designed,'however, for operating upon old flues to be reclaimed.

Figure 5 is a fragmentary view in section, with parts in elevation, and showing arflue having an end portion longer than that illustrated in Figure 4.

Figure 6 is a view in section and elevation, showing the use of washers between the rolls and an element on which the axial members of the rolls are mounted, this arrangement permitting the rolls to be properly positioned with reference to the joint to be welded.

Figure 7 is a view similar to Figure 6, but showing a single washer at each end of the roll, in order to place the latter in the position desired with reference to the weld.

Figure 8 shows one of the rolls in elevavation, this roll having a long cylindrical portio e 4 is a view similar to Figure 3, the

- Figure 9 shows two sizes of rolls, in which the cylindrical portions are shorter than in Figure 8. Y l

Figure 10 is an elevation of the end portion of a new. tube, reduced as required.

Figure 11 is a view in elevation, with a portion broken away, showing the end of a tube which has been reduced and scarfed, the tube being shorter than the tube of Figure 10, because of the necessity of cutting od a defective end portion. A

Figure 12 is a view in elevation showing a welded joint, in full lines, a safety end portion having been welded on tothe reclaimed tube, thisfigure also-showing, indotted lines, the position at whichl a cut would have to be made subsequently if the tube is to bereconditioned a second time.

; In Figures 1, 2 and 3, I have illustrated the essential features of a vmachine of standard construction, suchfas that disclosedin U. S.

Patent No. 633,136, issued September l19, 1899, this machine being illustrated, in the present case as being provided with the particular mandrel and rolls forming.l the subject matter of the case under consideration.

" A foot lever l'controls a lever or levers 11, through connections 12 and 13, and the lever orlevers 11 controla slidable collar 15 to which arms 16 are connected by llinks or the like designated 17. The arms 16 are pivoted atk18,'andA carry devices mounting the rolls having cooperation with the mandrel.

iV bracket -20 is provided with a slot l21, through which a bolt or pin 22 passes, this element 22 also' passing throughV a slide 23, which is vertically adjustable by means of the screw 24, a particular adjustment being .maintained by'nut and washer 25vv and 26 carried by bolt or pin 22 and adapted to engage the surfaceof element 20. The slide 23 'carriesa pin or bolt'28 constituting the-axial element of each roll 30, a nut 31V received in recess 32, and engaging the-bolt serving to retainthe-'rolL The several rolls include cylindrical portions 33, the'length of which depends upon the use toV which the roll is to be put. The roll further includes a tapered portion 34.

The assembly of Figure 3is designed forreducing new flues, it being unnecessary to add or weld on any end section or safety end, as in other cases to be described. lIhe mandrel is tapered at its outer end, this element being designated 85, and being carried by an axial member 36 engaged by a nut 37. 'Ihe reduced end of the mandrel permits of easy andprompt withdrawal ofthe flue, after it has been reduced. The lue being operated upon and constituting the work is designated 38, and the reduced portion is Vshown at 39, the portion 40 being cylindrical and constituting the end of the flue. End port-ion 40 engages a flange or collar 4lvon the end of the mandrel, constituting a stop, and forming an important. feature of the construction. A tapered portion 44 provides for opening and scarfing the end 45 of the tube so that an end section may be welded thereto, and the rolls 30 of Figures 4 and 5 are shown as operating upon tubes in which the reduced end portions are of different lengths. Washers 47 and 48 are mounted at the outer end of bolt or pin 49, and serve as spacing devices for retaining rollers 30- in the position indicated in the joint to be Welded. In Figures 6 these washers 47 and 48 have been moved to position at the opposite end of rollers 80', so that the nut 49 engages the body portion of said rollers, this arrangement being employed when an end or safety end 44 is to be welded onto the ends of the tube. In Figure 7, the washers 47 and 48 are positioned at opposite ends of the roller 30, the safety end being shorter than in Figure 6. v

Figures 8 and 9 illustrate rollers' of different sizes or lengths adapted for'performing different operations. Figure` 10 shows the reduced end 50 of a new tube 51, the reduction havingbeen effected on a machine carrying rollers and a mandrelof the kind herein demerging into each other intermediate the ends of said mandrel, rolls removably mounted on the movable supports and having cylindrical and tapered portions merging into each other intermediate the ends thereof and of shorter lengths than the portions of the mandrel, and spacing velements interchangeable froin one-end of eachl movable support to the other end thereof to vary the positions of the rolls endwise relatively to the mandrel and thereby `vary the cylindrical and tapered portions of said rolls relative to the cylindrical and tapered portions of the said mandrel. n

2. A device of the character set forth comprising afixed mandrel, a pluralitypf movable supports, rolls removably mountednon said ysupports to restrict a tube on thefixed v mandrel, a flangeat one end ofthe fixed mandrel, an inclined shoulder on the iXed mandrel adjacent the flange to cooperate'with the latter to scarf the end Vof a tubel whenV com-1. pressed by the rolls, and spacing elements interchangeable fromV the ends of the support to the other end thereof to adjust the rolls towards and from the flange' vand shoulder. f

In testimony whereof I aliix my signature.

WILLIAMA. DUNCAN.

scribed. Y Figure 11 shows a ytube 52 having a reduced and scarfed end 53,'and Figure l2 shows a safety endl 5 4 welded at 55,. to the reduced end of a tube 56. This viewalso shows in` dotted lines, where the weld willbe made in the event that the tube is shortened when reconditioneda second time. Y

It may be added' that the mandrel 35 is advanced and retracted in the standard machine disclosed by means oflever 60 whichindirectly imparts slidable movement to 'element 61, and a vertical element 62 connected therewith for operating a yoke, member 6,3, imparting thrust to the axial member ofthe mandrel. ,e

Having thus described the invention, what is claimed as new, is

l. A device of the character described including a centrally arranged non-movable support and a plurality of movable supports 4arranged about the non-movablesupport, a vmandrel mounted on said non-movable support'to receive a tube thereon and having elongated cylindrical and tapered portions 

